Linux kernel mirror (for testing)
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1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _UVC_QUEUE_H_
3#define _UVC_QUEUE_H_
4
5#include <linux/list.h>
6#include <linux/poll.h>
7#include <linux/spinlock.h>
8
9#include <media/videobuf2-v4l2.h>
10
11struct file;
12struct mutex;
13
14/* Maximum frame size in bytes, for sanity checking. */
15#define UVC_MAX_FRAME_SIZE (16*1024*1024)
16/* Maximum number of video buffers. */
17#define UVC_MAX_VIDEO_BUFFERS 32
18
19/* ------------------------------------------------------------------------
20 * Structures.
21 */
22
23enum uvc_buffer_state {
24 UVC_BUF_STATE_IDLE = 0,
25 UVC_BUF_STATE_QUEUED = 1,
26 UVC_BUF_STATE_ACTIVE = 2,
27 UVC_BUF_STATE_DONE = 3,
28 UVC_BUF_STATE_ERROR = 4,
29};
30
31struct uvc_buffer {
32 struct vb2_v4l2_buffer buf;
33 struct list_head queue;
34
35 enum uvc_buffer_state state;
36 void *mem;
37 struct sg_table *sgt;
38 struct scatterlist *sg;
39 unsigned int offset;
40 unsigned int length;
41 unsigned int bytesused;
42};
43
44#define UVC_QUEUE_DISCONNECTED (1 << 0)
45#define UVC_QUEUE_DROP_INCOMPLETE (1 << 1)
46#define UVC_QUEUE_PAUSED (1 << 2)
47
48struct uvc_video_queue {
49 struct vb2_queue queue;
50
51 unsigned int flags;
52 __u32 sequence;
53
54 unsigned int buf_used;
55
56 bool use_sg;
57
58 spinlock_t irqlock; /* Protects flags and irqqueue */
59 struct list_head irqqueue;
60};
61
62static inline int uvc_queue_streaming(struct uvc_video_queue *queue)
63{
64 return vb2_is_streaming(&queue->queue);
65}
66
67int uvcg_queue_init(struct uvc_video_queue *queue, struct device *dev, enum v4l2_buf_type type,
68 struct mutex *lock);
69
70void uvcg_free_buffers(struct uvc_video_queue *queue);
71
72int uvcg_alloc_buffers(struct uvc_video_queue *queue,
73 struct v4l2_requestbuffers *rb);
74
75int uvcg_query_buffer(struct uvc_video_queue *queue, struct v4l2_buffer *buf);
76
77int uvcg_queue_buffer(struct uvc_video_queue *queue, struct v4l2_buffer *buf);
78
79int uvcg_dequeue_buffer(struct uvc_video_queue *queue,
80 struct v4l2_buffer *buf, int nonblocking);
81
82__poll_t uvcg_queue_poll(struct uvc_video_queue *queue,
83 struct file *file, poll_table *wait);
84
85int uvcg_queue_mmap(struct uvc_video_queue *queue, struct vm_area_struct *vma);
86
87#ifndef CONFIG_MMU
88unsigned long uvcg_queue_get_unmapped_area(struct uvc_video_queue *queue,
89 unsigned long pgoff);
90#endif /* CONFIG_MMU */
91
92void uvcg_queue_cancel(struct uvc_video_queue *queue, int disconnect);
93
94int uvcg_queue_enable(struct uvc_video_queue *queue, int enable);
95
96struct uvc_buffer *uvcg_queue_next_buffer(struct uvc_video_queue *queue,
97 struct uvc_buffer *buf);
98
99struct uvc_buffer *uvcg_queue_head(struct uvc_video_queue *queue);
100
101#endif /* _UVC_QUEUE_H_ */
102